Jordan Valve Mark 688 User Manual
Mark 688 Series
3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
info@richardsind.com • www.jordanvalve.com
Mark 688 Piloted Soft Seat Regulators
Installation Instructions for
Warning: Jordan Valve Pressure Regulators must only be used, installed and repaired in accordance with these Installation & Maintenance Instructions. Observe all applicable public and company codes and regulations. In the event
of leakage or other malfunction, call a qualified service person; continued operation may cause system failure or a
general hazard. Before servicing any valve, disconnect, shut off, or bypass all pressurized fluid. Before disassembling
a valve, be sure to release all spring tension.
Please read these instructions carefully!
and be thoroughly familiar with API 2000, Standard
Information for Tank Blanketing Regulator Selection
Your Jordan Valve product will provide you with long,
trouble-free service if it is correctly installed and main-
before installing and attempting to operate this
product.
tained. Spending a few minutes now reading these instructions can save hours of trouble and downtime later.
Control Line
When making repairs, use only genuine Jordan Valve
parts, available for immediate shipment from the factory.
Ideal Installation
A control line must be installed as follows:
1. Connect one end of a ¾” pipe to the fitting on top
of the main valve actuator.
Gas Supply
2. Connect the other end to an appropriate fitting on
the tank.
Conservation Vent
Blanketing
Valve
3. DO NOT locate the control line tap in any location
where turbulence or abnormal velocities may occur.
Emergency
Pressure Vent
Control Line
1. To protect the valve from grit, scale, thread chips
and other foreign matter, ALL pipelines and piping
Control line should
slope downward toward
the tank to prevent
Condensation buildup.
1. Make the control line as short
and straight as possible.
2. Connect the control line to
the point where the pressure
is to be controlled.
3. Increase 1 pipe size for every
10 feet of control line, with
setpoints less than 5" w.c.
(0,012 bar).
Blanketing Gas
Control line
components should be blown out and thoroughly
cleaned before the installation process begins.
2. Shutoff valves, pressure gauges and by-pass piping are optional, and if installed should be in accordance with all applicable codes, standards, and
practices. They are recommended to provide easier
4. The control line should be sloped away from the
valve.
5. Install a pressure gauge to measure pressure in the
tank itself, not in the outlet piping or the control line
to aid in setting the valve.
adjustment, operation, and testing.
3. The flow arrow on the valve body must be pointed
in the direction of flow. Ideally, the valve should be
installed in the highest horizontal line of piping.
Control Line Piping Recommendation
4. If possible, install a relief valve downstream from
the valve. Set at slightly above the control point of
the valve but below the maximum safety limit for
the tank.
5. It is strongly recommended that the installer read
Keep the regulator as close to the tank as possible
and as high as possible.
Minimize the length of the downstream pipe com-
ing from the valve.
NEVER reduce the pipe size on the valve outlet to
the tank. This line must always be as large as the
valve size, or one pipe size larger to assure it does
not act as a restriction.
Any downstream isolation valve after the regulator
must be a full port type. The isolation valve cannot
act as a restriction.
The sensing line must be a minimum of 3/4" pipe.
A sensing line isolation valve is recommended.
Again, must be full ported.
Slope the sensing line to the sensing port on the
tank.
Keep the sensing line as short and straight as pos-
sible.
For each 10 feet of sensing line, increase the line
size by one pipe diameter. (Especially important on
the blanket pressures of less than 5 inches of water
column).
Keep the sensing port on the tank as far removed
as possible from the downstream pipe outlet going
into the tank.
Start-Up
With the inlet, outlet, and bypass shutoff valves closed,
and no pressure in the downstream line:
1. Slowly open the inlet valve just enough to start
flow through the valve. Observe the tank pressure
gauge. Increase the downstream pressure slowly
by gradually opening the inlet valve.
2. Do not fully open the inlet valve until you are sure
that the regulator has control of the system. Usually, the handwheel on the inlet valve will turn freely
when this is achieved.
3. To change the controlled pressure, adjust the
controlled pressure supplied to the top of the diaphragm.
The next step is to determine what could cause the
trouble. The third step is to locate and remedy the cause
by the process of elimination. Make no assumptions and
check the easy ones first. The guide below lists the controlled pressure action, common causes and procedure
for checking each cause.
Controlled pressure action UNDER PRESSURE:
Valve undersized for application. Check capacity
required and valve capacity.
Line strainer screen clogged. Blow down strainers
or visually check that they are clear.
Incorrect setting on range spring. Vary the setting
and check response.
Main valve diaphragm or balance diaphragm rup-
tured. See action on valve maintenance.
Malfunction of other piping components. Check
for leaking safety valves, inadvertently opened or
closed valves.
Controlled pressure action OVER PRESSURE:
Incorrect setting on range spring. Vary the setting
and check response.
Main valve seats leaking. Close inlet shut-off valve,
allow downstream pressure to bleed off, close outlet valve and remove loading pressure tubing. Back
out adjusting screw on valve until free. Crack open
inlet shut-off valve - if the fluid issues from the main
valve port, the main valve seats are leaking.
By-pass shut-off leaking. During period of leakage
close outlet shut-off valve, observe downstream
pressure gauge.
Controlled Pressure Fluctuates:
Valve oversized. Check capacity required and valve
capacity.
Main Valve
Trouble Shooting
The first step in troubleshooting a piloted pressure regulator is to classify the action of the controlled pressure
into one of the following categories:
A. Under Pressure: Controlled pressure too low; not
enough flow or no flow through valve.
B. Over Pressure: Valve will not close or controlled
pressure increases after valve closes.
C. Pressure Fluctuates: Controlled pressure rises and
falls, will not settle out under low loads.
Note: All work to the main valve can be accomplished
in-line. The only reason to remove the valve is if
the location makes it too difficult to work on the
regulator.
Main Valve Diaphragm
1. Remove pilot valve tubing.
2. Remove the control line to the upper case.
3. Remove the actuator bolts (24) and nuts from the
upper and lower actuator cases. Important - leave
two opposing bolts assembled.
4. Use caution when removing the final two bolts. The
upper case is spring-loaded by the internal return
spring (21).
5. Remove the return springs from the diaphragm plate
(21).
6. Remove the valve stem bolt (31) and seal washer
(27) from the diaphragm assembly.
7. Remove the seal washer (33) from the center of the
diaphragm plate.
8. Lift off the diaphragm plate (20) and remove the
diaphragm (19).
9. Inspect and replace as required by reversing the
above steps.
10. When re-assembling, it is necessary to balance the
lower support plate (11) on top of the valve plug/
stem assembly (8). Make sure the valve stem bolt
engages all parts in the diaphragm assembly before
tightening. Use a new seal washer (17).
11. To tighten the valve stem bolt, hold the outside of
the diaphragm plate to prevent the assembly from
turning while tightening the bolt.
12. Make sure to locate the return springs on the
stamped guides in the diaphragm plate before assembling the upper case.
16. Assemble the plug o-ring (30) and seal (27) to the
plug groove. Place an additional amount of grease
on the outside of the seal and carefully insert the
plug / stem into the cage (9) being careful not to
damage the o-ring.
17. Place the cage and plug / stem on top of the seat
assembly in the body.
18. Place a new spacer (12) on top of the cage.
19. Insert the bonnet (2) over the stem and onto the
body.
20. Assemble the 4 body bolts (3) using an even
cross-torquing method. Torque to 75 ft-lbs.
21. Place the packing spring (16), retainer (15), new set
of packing (14), and the packing follower (15) into
the packing bore of the bonnet. Lubricate each
piece of packing upon installation.
22. Place the lower actuator assembly over the bonnet.
Make certain the port on the lower case is oriented to the same side as when it was removed, and
is 90° to the flow direction.
23. Secure the actuator nut (7) to the lower case using
a minimum of 100 ft-lbs or torque.
24. Follow the steps outlined above under “Main Valve
Diaphragm” to finish assembling the actuator.
Main Valve Seats
1. Remove diaphragm as listed above.
2. Remove the actuator nut (7) from the lower case.
3. Lift the lower case assembly off of the bonnet.
4. Remove the 4 body bolts (3).
5. Lift off the bonnet assembly (2) from the main valve
plug / stem assembly (8).
6. Remove the plug / stem and cage (9) from the body
bore. Note - the cage will normally come out with
the plug.
7. Remove the seat assembly and o-ring (25) from the
bore of the body.
8. Separate the plug / stem from the cage.
9. Remove plug -O-ring (30) and seal (27).
10. Clean all parts with a light solvent.
11. Replace o-ring numbers (25), (29), (30), & seal (27).
12. Use a light grease, such as Dow Corning #4 to lubricate all o-rings prior to re-assembly.
13. Place the seat o-ring (30) into the body bore, pushing it all the way into the corners of the bore.
14. Place the seat ring (13) on top of the o-ring.
15. Insert a new soft seat (10) into the groove on the
seat ring.
Parts List
23
33
31
7
28
26
14
Detail M
16
24
Item No. Description Quantity
1 Body 1
2 Bonnet 1
3 HHCS, 1/2-13 x 1-1/4" 4
4 Lower Actuator Case 1
5 Mounting Plate 1
6 HHCS, 5/16-18 x 3/4" 6
7 Ring Nut 1
8 Plug 1
9 Cage 1
10 Soft Seat Insert 1
11 Backing Plate 1
12 Compressor 1
13 Seat 1
14 Pacing 1
15 Packing Follower/Retainer 2
16 Packing Spring 1
17 Threadseal 8
18 Upper Actuator Case 1
19 Diaphragm 1
20 Diaphragm Plate 1
21 Return Spring 6
22 HHCS, 3/8-16 x 1-1/2" 3
23 HHCS, 3/8-16 x 1" 27
24 Hex Nut, 3/8-16 32
25 O-Ring #345 1
26 O-Ring #219 1
27 Plug Seal 1
28 O-Ring #222 1
29 O-Ring #154 1
30 O-Ring #138 1
31 HHCS, 5/16-18 x 1" 1
32 HHCS, 3/8-16 x 1-3/4" 2
33 Seal Washer 1
45 3
17
15
17 6
12
27
30
20
32
3
29
1
Section D-D
Scale 1:2
21
32
22
18
19
11
4
4
5
2
8
9
10
25
13
Detail L
Bulletin IM-MK688-0113
3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
info@richardsind.com • www.jordanvalve.com
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